– Technically, the E in the mnemonic should stand for Echovirus (causes aseptic meningitis), since the viruses in the PERC part of the mnemonic are all in the Enterovirus genus of the Picornavirus species, but I’ve found in practice and on tests that this version of the mnemonic works well!).

– There is a significant amount of cross-over in the diseases each virus causes (for example, most of these viruses are known for causing aseptic meningitis (except with Rhinovirus and HAV), enterovirus 71 can cause Hand, foot, mouth disease, and polio can cause aseptic meningitis without paralysis), but I listed the classic (AKA- on the USMLE) associations here.